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New Journal of Physics

Phase-modulated shaping of narrowband type-I parametric down-converted photons

Andrea T. Joseph, Roger Andrews, Edward R. Pike, Sarben Sarkar

Published Jun 9, 2006• 3 citations
Publisher

Abstract

We present a general theoretical description of the temporal shaping of narrowband noncollinear type-I down-converted photons using a spectral phase filter with a symmetric phase distribution. By manipulating the spectral phase of the signal or idler photon, we demonstrate control of the correlation time and shape of the two-photon wavefunction with modulation frequency and modulation depth of the phase distribution.

DOI
10.1088/1367-2630/8/6/091

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We present a general theoretical description of the temporal shaping of narrowband noncollinear type-I down-converted photons using a spectral phase filter with a symmetric phase distribution. By manipulating the spectral phase of the signal or idler photon, we demonstrate control of the correlation time and shape of the two-photon wavefunction with modulation frequency and modulation depth of the phase distribution.
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We demonstrate control of the two-photon absorption probability for a simple three-level atom using type-I nondegenerate down-converted photons that have been phase-modulated using a spectral phase filter of variable modulation frequency and modulation depth. We find enhancement of two-photon absorption for entangled photons, as compared with that for unentangled photons. We also find that, for certain pairs of modulation frequency and depth values, we can either further enhance or suppress the absorption process relative to that for zero phase modulation.
We experimentally demonstrate temporal shaping of a heralded single-photon wave packet, prepared by conditional measurement of the idler photon of the entangled photon pair in the process of spontaneous parametric down-conversion. The heralded single-photon wave packet for the signal photon, after being tailored with the help of chirp broadening and interference effects, was observed directly by measuring the time-correlated single-photon-counting histogram. We also demonstrate remote control of the temporal shaping effect by spectral filtering of the idler photon.